Drilling machine

ABSTRACT

A drilling machine comprises a power motor unit coupled with a spiral rod and a drill bit shaft and assembled in a mounting frame using a positioning disc. The arbor of power motor mounted on the mounting frame directly drives the drill bit shaft. The spiral rod is disposed at the periphery of drill bit shaft. A plurality of cutters are arranged between the drill bit and spiral rod at the outer perimeter of drill bit with a hollow guide notch above the cutters. The spiral rod is mounted in the positioning disc and engage a plurality of planet gears. When the arbor of power motor turns, it directly drives the drill bit shaft, drives the fast turning of drive gear at the periphery of drill bit shaft, resulting in different turning speeds with the drill bit shaft turning slowly and the spiral rod turning fast.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present structure relates to a drilling machine that operatesthrough a power motor unit in a mounting frame to produce varyingturning speeds for the rotary rod and the drill bit shaft to allowsmooth drilling in one try. In addition, through the turning of rotaryrod, drilled materials are continuously and rapidly brought to thesurface through a guide notch to achieve smooth drilling in differentoccasions while easing the burden on the hands of operator.

2. Description of the Related Art

Currently drilling in soil runs into a problem where the driller wouldcontinuously and automatically bore downward as the machine is pulleddown by gravity. Although the drill bit is able to bore a hole and thereare grooves around the bit to remove the drilled soil, the drill bitoften gets stuck as it bores down further for the speed of soil removalcannot catch up with the drilling speed. Moreover, as the soil itself isloose and soft, the soil adjacent to the hole bored tends to cave intothe hole and “envelop” the drill bit, making it more likely to getstuck. For the same reason that the chip removal speed cannot stay upwith the drilling speed, the same problem occurs when drilling in wood,cement, metal or other materials that the deeper the drill bit goes, themore difficult it becomes to remove the chips produced. As the drill bitdoes the drilling and constantly rubs with the chips that are notremoved in time, the drill bit not only gets stuck easily, it is alsosubject to severe wear and tear, which is far from being ideal. Thusthis invention is proposed.

SUMMARY OF THE INVENTION

The primary object of the present invention is to provide a drillingmachine comprising a power motor unit coupled with a spiral rod and adrill bit shaft assembled in a mounting frame using a positioning disc.The arbor of power motor directly drives the drill bit shaft. Aplurality of cutters and a hollow guide notch above the cutters arearranged at the outer perimeter of the drill bit of drill bit shaft. Thespiral rod at the periphery of drill bit shaft matches and engages aplurality of planet gears through a drive gear, which are then assembledinto one body by two rotating discs. As such, when the arbor of powermotor turns, it directly drives the drill bit shaft, and at the sametime, drives the fast turning of drive gear at the periphery of drillbit shaft. Thus when drilling a hole, the center tip of drill bit firstaligns in position and then drills downward to guide the peripherallyarranged cutters to perform rotary cutting and drilling, therebyachieving smooth drilling and easing the burden on the hands ofoperator.

Another object of the present invention is to provide a drillingmachine, wherein the top of the spiral rod is mounted in the positioningdisk through a drive gear and engage a plurality of planet gears, whichare then assembled into one body between two rotating discs. As such,when the arbor of power motor turns, it directly drives the drill bitshaft, as well as the turning of connecting plate and rotating disc,which causes the plurality of planet gears positioned between tworotating discs to travel along the inner annular gear of positioningdisc and leads to the fast turning of drive gear at the periphery ofdrill bit shaft, thereby resulting in slow turning of drill bit shaftand fast turning of spiral rod.

Yet another object of the present invention is to provide a drillingmachine, wherein when drilling a hole at a predetermined position, thespiral rod with turning speed faster than the drill bit wouldcontinuously and rapidly remove chips from the cutting to surfacethrough the guide notch and spiral blades. As such, it is less likelyfor the drill bit to get stuck or sustain serious wear as in prior art.The burden on the hands of the operator also becomes less, which areprone to injury from continuous vibration.

A further object of the present invention is to provide a drillingmachine, wherein the drill bit can be changed in light of the materialto be drilled when it is applied to drilling farm soil, civil work,cement, steel plate, mining or geological survey.

Yet another further object of the present invention is to provide adrilling machine, wherein the number of teeth of planet gears situatedbetween two rotating discs and traveling along the internal annular gearof positioning disc can be adjusted in view of the worksite condition.As such, the drive gears arranged at the periphery of drill bit shaftcan have different turning speeds for cutting and drilling.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is an exploded view of the invention.

FIG. 2 is a perspective view of the invention after assembly.

FIG. 3A is a perspective view of the invention after assembly in amounting frame (1).

FIG. 3B is a perspective view of the invention after assembly in amounting frame (2).

FIG. 4-A is a partial cut-away view of the invention (1).

FIG. 4-B is a partial cut-away view of the invention (2).

FIG. 5A is a diagram showing the operation of the invention coupled withaccessory equipment (1).

FIG. 5B is a diagram showing the operation of the invention coupled withaccessory equipment (2).

FIG. 6A shows an embodiment of the invention (1).

FIG. 6B shows an embodiment of the invention (2).

FIG. 6C shows an embodiment of the invention (3).

FIG. 7 shows another embodiment of the invention (2).

FIG. 8 shows another embodiment of the invention (3).

FIG. 9 shows another embodiment of the invention (4).

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

Referring to FIG. 1, FIG. 2, FIG. 3A and FIG. 3B, the drilling machineof the invention comprises a power motor unit 3 coupled with a spiralrod 2 and a drill bit shaft 1 with different turning speeds, which areassembled in a mounting frame 4, the mounting frame 4 being assembledwith a handle 41 for holding by both hands of the operator and a linearswitch 42. The arbor 31 of power motor 3 in the mounting frame 4 isdirectly coupled to the drill bit shaft 1 through a sleeve 3A and aconnecting plate 3B. A spiral rod 2 is arranged at the periphery ofdrill bit shaft 1. Between the drill bit 11 and spiral rod 2 at theperiphery of drill bit 11, there are provided a plurality of cutters 12and a hollow guide notch 13 above the cutters 12. At the top of spiralrod 2, a drive gear 22 is situated in a positioning disc 21 and match aplurality of planet gears, the outer periphery of respective planet gear23 engaging the internal annular gears of positioning disc 21, while itsinside engaging the drive gear 22 on spiral rod 2, which are assembledinto one body between two external rotating discs 24. The entirepositioning disc 21 is then mounted in the mounting frame 4 throughconnecting bracket 4A. As such, when the arbor 31 of power unit 3rotates, it directly drives the turning of drill bit shaft 1 as thearbor is directly coupled to the drill bit shaft 1 through the sleeve 3and connecting plate 3B (as shown in FIG. 4-A). At this time, becausethe arbor 31 of power motor 3 drives the turning of connecting plate 3Band rotating discs 24, the plurality of planet gears 23 situated betweentwo rotating discs 24 travel along the inner annual teeth 211 ofpositioning disc 21 (as shown in FIG. 4-B), which in turn drives theturning of drive gear 22 situated at the periphery of drill bit shaft 1.Even under the design where the teeth of both drive gear 22 and planetgear 23 are less than the teeth of inner gear 211 of positioning disc21, it leads to the faster turning of spiral rod 2 attached to andsituated under the drive gear 22. As such, it results in differentturning speeds with drill bit shaft 1 turning slower than spiral rod 2.

When boring a hole in soil (as shown in FIGS. 6A, 6B and 6C) with theinvention held in hands or using an accessory equipment (as shown inFIGS. 5A, 5B and 5C), align the center tip 111 of drill bit 11 of thedrill bit shaft 1 in position and drill downward. In turn, it will guidethe peripherally arranged cutters 12 to perform rotary cutting andboring. Because the cutting diameter of cutters 12 is bigger than theworking diameter of center tip 111, while the outer diameter of rotaryblade 25 is bigger than the rotary cut diameter of cutters 12, the soilA1 bored during the drilling will be continuously and rapidly broughtout of hole A2 through a guide groove 112 and the guide notch 13 abovethe cutter 12 under the action of rotary blade 25 turning faster thanthe drill bit 11. As such, it is less likely for the drill bit to getstuck or sustain serious wear as in prior art. The burden on the handsof the operator also becomes less, which are prone to injury fromcontinuous vibration.

The drill bit 11 can be changed in view of the material to be drilled,such as soil A, wood B (as in FIG. 7), cement C (as in FIG. 8), or metalwhen it is applied to drilling farm soil, civil work, cement, steelplate, or even mining or geological survey (as shown in FIG. 9). Also inview of the occasion, the matching ratio between the teeth of planetgears 23 and the teeth of drive gear 22 disposed at the periphery ofdrill bit shaft 1 may be adjusted to produce different turning speedsfor the drive gear and make the drilling process smoother.

1. A drilling machine comprising a power motor unit coupled with aspiral rod and a drill bit shaft and assembled in a mounting frame usinga positioning disc, the arbor of power motor directly driving the drillbit shaft, a plurality of cutters being arranged at the outer perimeterof drill bit of the drill bit shaft and having a hollow guide notchabove, the spiral rod at the periphery of drill bit shaft matching andengaging a drive gear and a plurality of planet gears in the positioningdisc and being assembled into one body between two rotating discs, suchthat when the arbor of power motor turns, it directly drives the drillbit shaft, and at the same time, drives the fast turning of drive gearat the periphery of drill bit shaft; when drilling a hole, the downwarddrilling of center tip of drill bit in turn guides the peripherallyarranged cutters to perform rotary cutting and drilling, therebyachieving smooth drilling while easing the burden on the hands ofoperator.
 2. A drilling machine as claimed in claim 1, wherein thespiral rod is positioned in the positioning disc through a drive gear atits top and engages a plurality of planet gears, which are assembledinto one body between two outer rotating discs, such that when the arborof power motor turns, it directly drives the drill bit shaft, and at thesame time, drives the turning of a connecting plate and the rotatingdiscs such that the plurality of planet gears between two rotating discswould travel along the inner annular gear of the positioning disc,leading to the fast turning of drive gear at the periphery of drill bitshaft and resulting in different turning speeds with the drill bit shaftturning slower than the spiral rod.
 3. A drilling machine as claimed inclaim 1, wherein when drilling a hole at a predetermined position, underthe action of spiral rod turning faster than drill bit, the materialdrilled is continuously and rapidly brought out of a hole through therotary blades without being stuck or seriously wearing the drill bit,thereby achieving smooth and fast drilling, while easing the burden onthe hands of operators which are prone to injury from continuousvibration.
 4. A drilling machine as claimed in claim 1, wherein thedrill bit is made of different materials in view of the drillingoccasion for applications to drilling farm soil, civil work, cement,steel plate, mining or geological survey.
 5. A drilling machine asclaimed in claim 1, wherein the number of teeth of planet gearstraveling along the inner annular gear of positioning disc situatedbetween two rotating discs can be adjusted such that the drive gear atthe periphery of drill bit shaft can work under varying turning speedsin cutting and drilling.